/**
 ******************************************************************************
 *
 * @file       homelocationutil.cpp
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 * @brief      Utilities to find the location of openpilot GCS files:
 *             - Plugins Share directory path
 *
 * @brief      Home location utility functions
 *
 * @see        The GNU Public License (GPL) Version 3
 *
 *****************************************************************************/
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "homelocationutil.h"

#include <stdint.h>
#include <QDateTime>

#include "worldmagmodel.h"

namespace Utils {
HomeLocationUtil::HomeLocationUtil()
{}

/**
 * @brief Get local magnetic field
 * @param[in] LLA The longitude-latitude-altitude coordinate to compute the magnetic field at
 * @param[out] Be The resulting magnetic field at that location and time in [mGau](?)
 * @returns 0 if successful, negative otherwise.
 */
int HomeLocationUtil::getDetails(double LLA[3], double Be[3])
{
    // *************
    // check input parms

    double latitude  = LLA[0];
    double longitude = LLA[1];
    double altitude  = LLA[2];

    if (latitude != latitude) {
        return -1; // prevent nan error
    }
    if (longitude != longitude) {
        return -2; // prevent nan error
    }
    if (altitude != altitude) {
        return -3; // prevent nan error
    }
    if (latitude < -90 || latitude > 90) {
        return -4; // range checking
    }
    if (longitude < -180 || longitude > 180) {
        return -5; // range checking
    }
    QDateTime dt = QDateTime::currentDateTime().toUTC();

    // Fetch world magnetic model
    int result   = WorldMagModel().GetMagVector(LLA, dt.date().month(), dt.date().day(), dt.date().year(), Be);
    Q_ASSERT(result == 0);

    return result;
}
}
